Cowl for propeller hubs



Oct. 8, 1929. I NELSON 1,730,742

cowL FOR FROPELLER HUBS Fislod Dec. 12. 1928 INVENTOR ARVID NELSON ATTORNEYS Patented on; s, 1929 ARVID NELSON, OI MILWAUKEE,

WISCONSIN, 'ASSIGNOR TO HAMILTON AERO MANU- FACTURING COMPANY, OF' MILWAUKEE, .WISCONSIN cowr. non raornnnnn nuns A'p'plication filed December. 12, 1928. Serial No. 325,489.

may be utilized to hold the edge of the spin-' ner'mo're firmly in place, and-pr ovide securing means which shall'be universally jointed,

' thus eliminating to a greatextentthe danger in a means.

of crystallization.

My means of accomplishing the foregoing object ma be more readily understood by having re erence to the accompanyin Idrawarea ings, which are hereto annexed an part of this specification, in which- Fig. 1 is a view, partly in elevation, ow ng my improved spinner and securin means; 9

Fig. 2 a front e evation; and Figs. 3- and 4 are imilar" reference numerals refer to similar parts throughout the entire description. As shown in the drawings, the propeller hub 1 is mounted upon an engine shaft 2, only a fragmentary portion of which is shown. The hub 1 1s s own with two arms, 3 and 4, which project radially and are adapted to receive the shanks of the propeller blades-(not shown). On theinner portion of the hub I secure a flange'5, to which issecured a base plate 6. This base plate 6 has a circumferential flange 7-,whi'ch provides a space 8, the purpose of which will be explained later;

A'conoidal spinner 9 which has two openings, 25 and 26,throug which the propeller blade shanks may pass, is constructed with its base of the same diameteras the flange 7 The openings 25 and 26 perniit the compression of the spinner base, so that it is possible to snap it into the space-8, the resilience of the metal holding it normally, in place, this be.-

pprtly in section and S detail views of the securpasses throughit- It will be ap arent .bolt. 1

- UNITEIS ,STATEs'f-PATE T F ing augmentedby the centrifugal force when the propeller is rotating, At the same time the base of the spinner 9 is prevented from being distorted by the centrifugal force, by means of the flange 7 on'thebase plate 6.

On the forward end of the hub 1 is mounted a'bushing 19, which'carriesa sleeve 10 threadedupon the bait 2. Inside this sleeve 10 I mount a cap11,wh ich has a concave internal shoulder 12 and-a; central opening 13.

A bolt 14 passes through this opening 13. I This bolt 14 has. a bifurcated head 15, the

upper portion 16 of which is convex and is.

fitted to the concave shoulder12.

The bifurcated portion'bf, thehead 15 straddles a pin 17 fixedly mounted in the ca 11, thus 'reventing the rotation. of the boil;

l tthoug permitting its movement. An annular space 18 is, provided intermediatethe head 15 and the inner wall of the cap 11.

The outer'end of the bolt 14is threaded, a washer 20' is fitted'thereto and enga es the spinner 9. A'butt 21 serves, when ti to holdthe base of the spinner 9 int 8formed b the flange 7 on the'base plate 6. It may be ound desirable in practice to pro vide a reinforcement 23 at the tip of the spintened,

y from the; foregoing descriptionthat have provided for a universal movement of the bolt 14, thus effectually avoiding' the tendency to "crystallize due. to

bending strain, and yet'it serves to hold the spinner 9 tightly a ainst the base plate 6. Having described my invention, what I regard as new, and desire to secure by Letters Patent of the United States, is:

1.- A cowl for propeller hubs, comprising a base 'platesecured to the hub, a circumferential flange on said plate, a conoidal spin-Q e space ner '9' adjacent'Tthe-place where. the bolt 14 ner, the base of which snaps into saidflange, I

a center bolt to hold said spinner in place, and a universal joint secured to said hub and said 2; The combination, with a propeller hub,

of a base plate mounted intermediate the enpeller blades, a circular flange on said base plate into which said spinnersnaps, an a universal joint in said means.

3. The combination, with a propeller huh, I of a base plate mounted intermediate the engine and the hub, a conoidal spinner, having openings thereinfor the shanks of the propelle'r blades, a circular flange on said base plate into which said spinner snaps,-athread ed bushing secured to the frontoit' the hub, a sleeve fitted therein, a peri heral flange thereon which engages the said bushing, a. cap mounted in said sleeve,said ca having a concave internal shoulder, a bolt swing a bifurcated head which straddles a pin iixedly mounted in said cap, the outside of said head being convex to fit said concave shoulder, a

thread on said bolt, and a'nut and washer thereon to draw said spinneragainst said base plate.

4.. A cowl for propeller hubs, comprising. a spinner which encloses said hub, and universally jointed means to hold said spinner in place, i

5. A cowl for propeller hubs, comprising a base late secured to the hub a circumifer ential ange on said plate,,a conoidal spinner, the base of which snaps into said flange,

and universally jointed means to hold said spinner in place.

6. A cowl for propeller' hubs, comprisin a base plate, a circumferential flange on sai plate, a conoidal spinner, the base of which snaps into said flange, and universally jointed means to hold said spinner in place.

\ 1 avno ,unnson.

) securing means to hold said spinner in place, 

